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Finding the Fourth Proportional to 1,280.43, 1,920.65 and 510.75

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Solution

The fourth proportional to 1,280.43, 1,920.65 and 510.75 is: 766.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.43 : 1,920.65 = 510.75 : x
  2. Step 2: Convert to fraction form
    1,280.43/1,920.65 = 510.75/x
  3. Step 3: Cross multiply
    1,280.43x = 1,920.65 × 510.75
  4. Step 4: Simplify right side
    1,280.43x = 980,969.43
  5. Step 5: Solve for x
    x = 980,969.43/1,280.43
  6. Step 6: Final answer
    x = 766.13

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Double scale
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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.