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Finding the Fourth Proportional to 1,287,390.84, 1,776,418 and 771,023.71

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Solution

The fourth proportional to 1,287,390.84, 1,776,418 and 771,023.71 is: 1,063,904.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,390.84 : 1,776,418 = 771,023.71 : x
  2. Step 2: Convert to fraction form
    1,287,390.84/1,776,418 = 771,023.71/x
  3. Step 3: Cross multiply
    1,287,390.84x = 1,776,418 × 771,023.71
  4. Step 4: Simplify right side
    1,287,390.84x = 1,369,660,396,870.78
  5. Step 5: Solve for x
    x = 1,369,660,396,870.78/1,287,390.84
  6. Step 6: Final answer
    x = 1,063,904.10

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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.