Home / 145,624.40-217,999.20-86,429.60

Finding the Fourth Proportional to 145,624.40, 217,999.20 and 86,429.60

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Solution

The fourth proportional to 145,624.40, 217,999.20 and 86,429.60 is: 129,384.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,624.40 : 217,999.20 = 86,429.60 : x
  2. Step 2: Convert to fraction form
    145,624.40/217,999.20 = 86,429.60/x
  3. Step 3: Cross multiply
    145,624.40x = 217,999.20 × 86,429.60
  4. Step 4: Simplify right side
    145,624.40x = 18,841,583,656.32
  5. Step 5: Solve for x
    x = 18,841,583,656.32/145,624.40
  6. Step 6: Final answer
    x = 129,384.80

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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.