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Finding the Fourth Proportional to 642,115.02, 886,125.24 and 387,417

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Solution

The fourth proportional to 642,115.02, 886,125.24 and 387,417 is: 534,639.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,115.02 : 886,125.24 = 387,417 : x
  2. Step 2: Convert to fraction form
    642,115.02/886,125.24 = 387,417/x
  3. Step 3: Cross multiply
    642,115.02x = 886,125.24 × 387,417
  4. Step 4: Simplify right side
    642,115.02x = 343,299,982,105.08
  5. Step 5: Solve for x
    x = 343,299,982,105.08/642,115.02
  6. Step 6: Final answer
    x = 534,639.39

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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.