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Finding the Fourth Proportional to 676,493.76, 933,652.80 and 390,008.64

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Solution

The fourth proportional to 676,493.76, 933,652.80 and 390,008.64 is: 538,264.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    676,493.76 : 933,652.80 = 390,008.64 : x
  2. Step 2: Convert to fraction form
    676,493.76/933,652.80 = 390,008.64/x
  3. Step 3: Cross multiply
    676,493.76x = 933,652.80 × 390,008.64
  4. Step 4: Simplify right side
    676,493.76x = 364,132,658,760.19
  5. Step 5: Solve for x
    x = 364,132,658,760.19/676,493.76
  6. Step 6: Final answer
    x = 538,264.62

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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.