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Finding the Fourth Proportional to 688,070.78, 949,531.11 and 386,262.62

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Solution

The fourth proportional to 688,070.78, 949,531.11 and 386,262.62 is: 533,038.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,070.78 : 949,531.11 = 386,262.62 : x
  2. Step 2: Convert to fraction form
    688,070.78/949,531.11 = 386,262.62/x
  3. Step 3: Cross multiply
    688,070.78x = 949,531.11 × 386,262.62
  4. Step 4: Simplify right side
    688,070.78x = 366,768,374,320.11
  5. Step 5: Solve for x
    x = 366,768,374,320.11/688,070.78
  6. Step 6: Final answer
    x = 533,038.73

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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.