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Finding the Fourth Proportional to 86,521, 119,290.80 and 72,201.46

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Solution

The fourth proportional to 86,521, 119,290.80 and 72,201.46 is: 99,547.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,521 : 119,290.80 = 72,201.46 : x
  2. Step 2: Convert to fraction form
    86,521/119,290.80 = 72,201.46/x
  3. Step 3: Cross multiply
    86,521x = 119,290.80 × 72,201.46
  4. Step 4: Simplify right side
    86,521x = 8,612,969,924.57
  5. Step 5: Solve for x
    x = 8,612,969,924.57/86,521
  6. Step 6: Final answer
    x = 99,547.74

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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.