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Finding the Fourth Proportional to 928.69, 1,281.59 and 514.69

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Solution

The fourth proportional to 928.69, 1,281.59 and 514.69 is: 710.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.69 : 1,281.59 = 514.69 : x
  2. Step 2: Convert to fraction form
    928.69/1,281.59 = 514.69/x
  3. Step 3: Cross multiply
    928.69x = 1,281.59 × 514.69
  4. Step 4: Simplify right side
    928.69x = 659,617.71
  5. Step 5: Solve for x
    x = 659,617.71/928.69
  6. Step 6: Final answer
    x = 710.27

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.