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Finding the Fourth Proportional to 85,812.70, 128,719.05 and 48,948.70

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Solution

The fourth proportional to 85,812.70, 128,719.05 and 48,948.70 is: 73,423.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.70 : 128,719.05 = 48,948.70 : x
  2. Step 2: Convert to fraction form
    85,812.70/128,719.05 = 48,948.70/x
  3. Step 3: Cross multiply
    85,812.70x = 128,719.05 × 48,948.70
  4. Step 4: Simplify right side
    85,812.70x = 6,300,630,162.74
  5. Step 5: Solve for x
    x = 6,300,630,162.74/85,812.70
  6. Step 6: Final answer
    x = 73,423.05

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Similar ratio
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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.