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Finding the Fourth Proportional to 921.68, 1,271.89 and 502.01

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Solution

The fourth proportional to 921.68, 1,271.89 and 502.01 is: 692.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.68 : 1,271.89 = 502.01 : x
  2. Step 2: Convert to fraction form
    921.68/1,271.89 = 502.01/x
  3. Step 3: Cross multiply
    921.68x = 1,271.89 × 502.01
  4. Step 4: Simplify right side
    921.68x = 638,501.50
  5. Step 5: Solve for x
    x = 638,501.50/921.68
  6. Step 6: Final answer
    x = 692.76

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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.