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Finding the Fourth Proportional to 1,056.32, 1,457.12 and 642.08

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Solution

The fourth proportional to 1,056.32, 1,457.12 and 642.08 is: 885.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.32 : 1,457.12 = 642.08 : x
  2. Step 2: Convert to fraction form
    1,056.32/1,457.12 = 642.08/x
  3. Step 3: Cross multiply
    1,056.32x = 1,457.12 × 642.08
  4. Step 4: Simplify right side
    1,056.32x = 935,587.61
  5. Step 5: Solve for x
    x = 935,587.61/1,056.32
  6. Step 6: Final answer
    x = 885.70

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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.