Home / 86,215.10-129,213-38,779.47

Finding the Fourth Proportional to 86,215.10, 129,213 and 38,779.47

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Solution

The fourth proportional to 86,215.10, 129,213 and 38,779.47 is: 58,119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,215.10 : 129,213 = 38,779.47 : x
  2. Step 2: Convert to fraction form
    86,215.10/129,213 = 38,779.47/x
  3. Step 3: Cross multiply
    86,215.10x = 129,213 × 38,779.47
  4. Step 4: Simplify right side
    86,215.10x = 5,010,811,657.11
  5. Step 5: Solve for x
    x = 5,010,811,657.11/86,215.10
  6. Step 6: Final answer
    x = 58,119.89

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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.