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Finding the Fourth Proportional to 1,287,834.90, 1,931,752.35 and 989,819.70

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Solution

The fourth proportional to 1,287,834.90, 1,931,752.35 and 989,819.70 is: 1,484,729.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,834.90 : 1,931,752.35 = 989,819.70 : x
  2. Step 2: Convert to fraction form
    1,287,834.90/1,931,752.35 = 989,819.70/x
  3. Step 3: Cross multiply
    1,287,834.90x = 1,931,752.35 × 989,819.70
  4. Step 4: Simplify right side
    1,287,834.90x = 1,912,086,531,551.30
  5. Step 5: Solve for x
    x = 1,912,086,531,551.30/1,287,834.90
  6. Step 6: Final answer
    x = 1,484,729.55

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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.