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Finding the Fourth Proportional to 630,689.88, 870,079.00 and 385,685.35

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Solution

The fourth proportional to 630,689.88, 870,079.00 and 385,685.35 is: 532,078.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,689.88 : 870,079.00 = 385,685.35 : x
  2. Step 2: Convert to fraction form
    630,689.88/870,079.00 = 385,685.35/x
  3. Step 3: Cross multiply
    630,689.88x = 870,079.00 × 385,685.35
  4. Step 4: Simplify right side
    630,689.88x = 335,576,726,120.59
  5. Step 5: Solve for x
    x = 335,576,726,120.59/630,689.88
  6. Step 6: Final answer
    x = 532,078.82

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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.