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Finding the Fourth Proportional to 388,420.30, 581,646.30 and 309,688.30

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Solution

The fourth proportional to 388,420.30, 581,646.30 and 309,688.30 is: 463,747.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,420.30 : 581,646.30 = 309,688.30 : x
  2. Step 2: Convert to fraction form
    388,420.30/581,646.30 = 309,688.30/x
  3. Step 3: Cross multiply
    388,420.30x = 581,646.30 × 309,688.30
  4. Step 4: Simplify right side
    388,420.30x = 180,129,053,848.29
  5. Step 5: Solve for x
    x = 180,129,053,848.29/388,420.30
  6. Step 6: Final answer
    x = 463,747.79

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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.