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Finding the Fourth Proportional to 402,259.60, 603,389.40 and 121,790.80

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Solution

The fourth proportional to 402,259.60, 603,389.40 and 121,790.80 is: 182,686.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,259.60 : 603,389.40 = 121,790.80 : x
  2. Step 2: Convert to fraction form
    402,259.60/603,389.40 = 121,790.80/x
  3. Step 3: Cross multiply
    402,259.60x = 603,389.40 × 121,790.80
  4. Step 4: Simplify right side
    402,259.60x = 73,487,277,737.52
  5. Step 5: Solve for x
    x = 73,487,277,737.52/402,259.60
  6. Step 6: Final answer
    x = 182,686.20

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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.