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Finding the Fourth Proportional to 128,545.98, 177,220.71 and 90,254.22

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Solution

The fourth proportional to 128,545.98, 177,220.71 and 90,254.22 is: 124,429.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,545.98 : 177,220.71 = 90,254.22 : x
  2. Step 2: Convert to fraction form
    128,545.98/177,220.71 = 90,254.22/x
  3. Step 3: Cross multiply
    128,545.98x = 177,220.71 × 90,254.22
  4. Step 4: Simplify right side
    128,545.98x = 15,994,916,948.90
  5. Step 5: Solve for x
    x = 15,994,916,948.90/128,545.98
  6. Step 6: Final answer
    x = 124,429.54

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1.5x scale

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.