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Finding the Fourth Proportional to 642,547.12, 886,737.90 and 387,848.56

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Solution

The fourth proportional to 642,547.12, 886,737.90 and 387,848.56 is: 535,244.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,547.12 : 886,737.90 = 387,848.56 : x
  2. Step 2: Convert to fraction form
    642,547.12/886,737.90 = 387,848.56/x
  3. Step 3: Cross multiply
    642,547.12x = 886,737.90 × 387,848.56
  4. Step 4: Simplify right side
    642,547.12x = 343,920,017,612.42
  5. Step 5: Solve for x
    x = 343,920,017,612.42/642,547.12
  6. Step 6: Final answer
    x = 535,244.82

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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.