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Finding the Fourth Proportional to 928.42, 1,281.20 and 508.77

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Solution

The fourth proportional to 928.42, 1,281.20 and 508.77 is: 702.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.42 : 1,281.20 = 508.77 : x
  2. Step 2: Convert to fraction form
    928.42/1,281.20 = 508.77/x
  3. Step 3: Cross multiply
    928.42x = 1,281.20 × 508.77
  4. Step 4: Simplify right side
    928.42x = 651,830.69
  5. Step 5: Solve for x
    x = 651,830.69/928.42
  6. Step 6: Final answer
    x = 702.09

Related Problems

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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.