Home / 142,007.20-212,751.60-86,538.40

Finding the Fourth Proportional to 142,007.20, 212,751.60 and 86,538.40

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Solution

The fourth proportional to 142,007.20, 212,751.60 and 86,538.40 is: 129,649.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,007.20 : 212,751.60 = 86,538.40 : x
  2. Step 2: Convert to fraction form
    142,007.20/212,751.60 = 86,538.40/x
  3. Step 3: Cross multiply
    142,007.20x = 212,751.60 × 86,538.40
  4. Step 4: Simplify right side
    142,007.20x = 18,411,183,061.44
  5. Step 5: Solve for x
    x = 18,411,183,061.44/142,007.20
  6. Step 6: Final answer
    x = 129,649.64

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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.