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Finding the Fourth Proportional to 1,423.76, 2,135.88 and 807.20

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Solution

The fourth proportional to 1,423.76, 2,135.88 and 807.20 is: 1,210.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.76 : 2,135.88 = 807.20 : x
  2. Step 2: Convert to fraction form
    1,423.76/2,135.88 = 807.20/x
  3. Step 3: Cross multiply
    1,423.76x = 2,135.88 × 807.20
  4. Step 4: Simplify right side
    1,423.76x = 1,724,082.34
  5. Step 5: Solve for x
    x = 1,724,082.34/1,423.76
  6. Step 6: Final answer
    x = 1,210.94

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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.