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Finding the Fourth Proportional to 631.19, 870.12 and 444.12

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Solution

The fourth proportional to 631.19, 870.12 and 444.12 is: 612.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.19 : 870.12 = 444.12 : x
  2. Step 2: Convert to fraction form
    631.19/870.12 = 444.12/x
  3. Step 3: Cross multiply
    631.19x = 870.12 × 444.12
  4. Step 4: Simplify right side
    631.19x = 386,437.69
  5. Step 5: Solve for x
    x = 386,437.69/631.19
  6. Step 6: Final answer
    x = 612.24

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Double scale
Find fourth proportional to 632.19, 871.50 and 445.12
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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.