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Finding the Fourth Proportional to 920.76, 1,270.80 and 528

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Solution

The fourth proportional to 920.76, 1,270.80 and 528 is: 728.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.76 : 1,270.80 = 528 : x
  2. Step 2: Convert to fraction form
    920.76/1,270.80 = 528/x
  3. Step 3: Cross multiply
    920.76x = 1,270.80 × 528
  4. Step 4: Simplify right side
    920.76x = 670,982.40
  5. Step 5: Solve for x
    x = 670,982.40/920.76
  6. Step 6: Final answer
    x = 728.73

Related Problems

Find fourth proportional to 460.38, 635.40 and 264
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.