Home / 86,686.20-130,029.30-42,319.80

Finding the Fourth Proportional to 86,686.20, 130,029.30 and 42,319.80

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Solution

The fourth proportional to 86,686.20, 130,029.30 and 42,319.80 is: 63,479.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,686.20 : 130,029.30 = 42,319.80 : x
  2. Step 2: Convert to fraction form
    86,686.20/130,029.30 = 42,319.80/x
  3. Step 3: Cross multiply
    86,686.20x = 130,029.30 × 42,319.80
  4. Step 4: Simplify right side
    86,686.20x = 5,502,813,970.14
  5. Step 5: Solve for x
    x = 5,502,813,970.14/86,686.20
  6. Step 6: Final answer
    x = 63,479.70

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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.