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Finding the Fourth Proportional to 977.94, 1,348.92 and 715.50

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Solution

The fourth proportional to 977.94, 1,348.92 and 715.50 is: 986.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.94 : 1,348.92 = 715.50 : x
  2. Step 2: Convert to fraction form
    977.94/1,348.92 = 715.50/x
  3. Step 3: Cross multiply
    977.94x = 1,348.92 × 715.50
  4. Step 4: Simplify right side
    977.94x = 965,152.26
  5. Step 5: Solve for x
    x = 965,152.26/977.94
  6. Step 6: Final answer
    x = 986.92

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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.