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Finding the Fourth Proportional to 920.78, 1,270.70 and 522.40

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Solution

The fourth proportional to 920.78, 1,270.70 and 522.40 is: 720.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.78 : 1,270.70 = 522.40 : x
  2. Step 2: Convert to fraction form
    920.78/1,270.70 = 522.40/x
  3. Step 3: Cross multiply
    920.78x = 1,270.70 × 522.40
  4. Step 4: Simplify right side
    920.78x = 663,815.17
  5. Step 5: Solve for x
    x = 663,815.17/920.78
  6. Step 6: Final answer
    x = 720.92

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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.