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Finding the Fourth Proportional to 907,612.80, 1,361,419.20 and 781,641.60

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Solution

The fourth proportional to 907,612.80, 1,361,419.20 and 781,641.60 is: 1,172,462.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    907,612.80 : 1,361,419.20 = 781,641.60 : x
  2. Step 2: Convert to fraction form
    907,612.80/1,361,419.20 = 781,641.60/x
  3. Step 3: Cross multiply
    907,612.80x = 1,361,419.20 × 781,641.60
  4. Step 4: Simplify right side
    907,612.80x = 1,064,141,881,758.72
  5. Step 5: Solve for x
    x = 1,064,141,881,758.72/907,612.80
  6. Step 6: Final answer
    x = 1,172,462.40

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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.