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Finding the Fourth Proportional to 901.19, 1,243.62 and 508.21

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Solution

The fourth proportional to 901.19, 1,243.62 and 508.21 is: 701.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.19 : 1,243.62 = 508.21 : x
  2. Step 2: Convert to fraction form
    901.19/1,243.62 = 508.21/x
  3. Step 3: Cross multiply
    901.19x = 1,243.62 × 508.21
  4. Step 4: Simplify right side
    901.19x = 632,020.12
  5. Step 5: Solve for x
    x = 632,020.12/901.19
  6. Step 6: Final answer
    x = 701.32

Related Problems

Find fourth proportional to 450.60, 621.81 and 254.11
Half scale
Find fourth proportional to 1,802.38, 2,487.24 and 1,016.42
Double scale
Find fourth proportional to 902.19, 1,245 and 509.21
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.