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Finding the Fourth Proportional to 645,956,470.60, 967,779,969.90 and 393,104,278.60

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Solution

The fourth proportional to 645,956,470.60, 967,779,969.90 and 393,104,278.60 is: 588,953,689.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,956,470.60 : 967,779,969.90 = 393,104,278.60 : x
  2. Step 2: Convert to fraction form
    645,956,470.60/967,779,969.90 = 393,104,278.60/x
  3. Step 3: Cross multiply
    645,956,470.60x = 967,779,969.90 × 393,104,278.60
  4. Step 4: Simplify right side
    645,956,470.60x = 380,438,446,911,069,248
  5. Step 5: Solve for x
    x = 380,438,446,911,069,248/645,956,470.60
  6. Step 6: Final answer
    x = 588,953,689.96

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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.