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Finding the Fourth Proportional to 256,406,603.70, 384,609,905.55 and 74,659,710.90

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Solution

The fourth proportional to 256,406,603.70, 384,609,905.55 and 74,659,710.90 is: 111,989,566.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,406,603.70 : 384,609,905.55 = 74,659,710.90 : x
  2. Step 2: Convert to fraction form
    256,406,603.70/384,609,905.55 = 74,659,710.90/x
  3. Step 3: Cross multiply
    256,406,603.70x = 384,609,905.55 × 74,659,710.90
  4. Step 4: Simplify right side
    256,406,603.70x = 28,714,864,357,639,308
  5. Step 5: Solve for x
    x = 28,714,864,357,639,308/256,406,603.70
  6. Step 6: Final answer
    x = 111,989,566.35

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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.