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Finding the Fourth Proportional to 143,445.60, 215,168.40 and 86,364.90

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Solution

The fourth proportional to 143,445.60, 215,168.40 and 86,364.90 is: 129,547.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,445.60 : 215,168.40 = 86,364.90 : x
  2. Step 2: Convert to fraction form
    143,445.60/215,168.40 = 86,364.90/x
  3. Step 3: Cross multiply
    143,445.60x = 215,168.40 × 86,364.90
  4. Step 4: Simplify right side
    143,445.60x = 18,582,997,349.16
  5. Step 5: Solve for x
    x = 18,582,997,349.16/143,445.60
  6. Step 6: Final answer
    x = 129,547.35

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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.