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Finding the Fourth Proportional to 399,999.40, 598,443.90 and 260,031.40

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Solution

The fourth proportional to 399,999.40, 598,443.90 and 260,031.40 is: 389,036.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,999.40 : 598,443.90 = 260,031.40 : x
  2. Step 2: Convert to fraction form
    399,999.40/598,443.90 = 260,031.40/x
  3. Step 3: Cross multiply
    399,999.40x = 598,443.90 × 260,031.40
  4. Step 4: Simplify right side
    399,999.40x = 155,614,205,138.46
  5. Step 5: Solve for x
    x = 155,614,205,138.46/399,999.40
  6. Step 6: Final answer
    x = 389,036.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.