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Finding the Fourth Proportional to 86,289,319.20, 129,433,978.80 and 40,939,687.20

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Solution

The fourth proportional to 86,289,319.20, 129,433,978.80 and 40,939,687.20 is: 61,409,530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,289,319.20 : 129,433,978.80 = 40,939,687.20 : x
  2. Step 2: Convert to fraction form
    86,289,319.20/129,433,978.80 = 40,939,687.20/x
  3. Step 3: Cross multiply
    86,289,319.20x = 129,433,978.80 × 40,939,687.20
  4. Step 4: Simplify right side
    86,289,319.20x = 5,298,986,605,123,432
  5. Step 5: Solve for x
    x = 5,298,986,605,123,432/86,289,319.20
  6. Step 6: Final answer
    x = 61,409,530.80

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1.5x scale

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.