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Finding the Fourth Proportional to 977.60, 1,478 and 977.60

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Solution

The fourth proportional to 977.60, 1,478 and 977.60 is: 1,478

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.60 : 1,478 = 977.60 : x
  2. Step 2: Convert to fraction form
    977.60/1,478 = 977.60/x
  3. Step 3: Cross multiply
    977.60x = 1,478 × 977.60
  4. Step 4: Simplify right side
    977.60x = 1,444,892.80
  5. Step 5: Solve for x
    x = 1,444,892.80/977.60
  6. Step 6: Final answer
    x = 1,478

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.