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Finding the Fourth Proportional to 977.20, 1,346.88 and 790

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Solution

The fourth proportional to 977.20, 1,346.88 and 790 is: 1,088.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.20 : 1,346.88 = 790 : x
  2. Step 2: Convert to fraction form
    977.20/1,346.88 = 790/x
  3. Step 3: Cross multiply
    977.20x = 1,346.88 × 790
  4. Step 4: Simplify right side
    977.20x = 1,064,035.20
  5. Step 5: Solve for x
    x = 1,064,035.20/977.20
  6. Step 6: Final answer
    x = 1,088.86

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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.