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Finding the Fourth Proportional to 901.07, 1,242.81 and 621.39

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Solution

The fourth proportional to 901.07, 1,242.81 and 621.39 is: 857.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.07 : 1,242.81 = 621.39 : x
  2. Step 2: Convert to fraction form
    901.07/1,242.81 = 621.39/x
  3. Step 3: Cross multiply
    901.07x = 1,242.81 × 621.39
  4. Step 4: Simplify right side
    901.07x = 772,269.71
  5. Step 5: Solve for x
    x = 772,269.71/901.07
  6. Step 6: Final answer
    x = 857.06

Related Problems

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Double scale
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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.