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Finding the Fourth Proportional to 977.79, 1,347.96 and 697.55

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Solution

The fourth proportional to 977.79, 1,347.96 and 697.55 is: 961.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.79 : 1,347.96 = 697.55 : x
  2. Step 2: Convert to fraction form
    977.79/1,347.96 = 697.55/x
  3. Step 3: Cross multiply
    977.79x = 1,347.96 × 697.55
  4. Step 4: Simplify right side
    977.79x = 940,262.76
  5. Step 5: Solve for x
    x = 940,262.76/977.79
  6. Step 6: Final answer
    x = 961.62

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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.