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Finding the Fourth Proportional to 1,318,862.40, 1,976,738.40 and 687,451.20

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Solution

The fourth proportional to 1,318,862.40, 1,976,738.40 and 687,451.20 is: 1,030,366.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,862.40 : 1,976,738.40 = 687,451.20 : x
  2. Step 2: Convert to fraction form
    1,318,862.40/1,976,738.40 = 687,451.20/x
  3. Step 3: Cross multiply
    1,318,862.40x = 1,976,738.40 × 687,451.20
  4. Step 4: Simplify right side
    1,318,862.40x = 1,358,911,185,166.08
  5. Step 5: Solve for x
    x = 1,358,911,185,166.08/1,318,862.40
  6. Step 6: Final answer
    x = 1,030,366.16

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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.