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Finding the Fourth Proportional to 608,407.61, 839,714.82 and 390,888.20

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Solution

The fourth proportional to 608,407.61, 839,714.82 and 390,888.20 is: 539,497.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,407.61 : 839,714.82 = 390,888.20 : x
  2. Step 2: Convert to fraction form
    608,407.61/839,714.82 = 390,888.20/x
  3. Step 3: Cross multiply
    608,407.61x = 839,714.82 × 390,888.20
  4. Step 4: Simplify right side
    608,407.61x = 328,234,608,350.11
  5. Step 5: Solve for x
    x = 328,234,608,350.11/608,407.61
  6. Step 6: Final answer
    x = 539,497.87

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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.