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Finding the Fourth Proportional to 921.18, 1,271.25 and 501.56

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Solution

The fourth proportional to 921.18, 1,271.25 and 501.56 is: 692.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.18 : 1,271.25 = 501.56 : x
  2. Step 2: Convert to fraction form
    921.18/1,271.25 = 501.56/x
  3. Step 3: Cross multiply
    921.18x = 1,271.25 × 501.56
  4. Step 4: Simplify right side
    921.18x = 637,608.15
  5. Step 5: Solve for x
    x = 637,608.15/921.18
  6. Step 6: Final answer
    x = 692.16

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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.