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Finding the Fourth Proportional to 936.76, 1,294.50 and 688.36

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Solution

The fourth proportional to 936.76, 1,294.50 and 688.36 is: 951.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.76 : 1,294.50 = 688.36 : x
  2. Step 2: Convert to fraction form
    936.76/1,294.50 = 688.36/x
  3. Step 3: Cross multiply
    936.76x = 1,294.50 × 688.36
  4. Step 4: Simplify right side
    936.76x = 891,082.02
  5. Step 5: Solve for x
    x = 891,082.02/936.76
  6. Step 6: Final answer
    x = 951.24

Related Problems

Find fourth proportional to 468.38, 647.25 and 344.18
Half scale
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Double scale
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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.