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Finding the Fourth Proportional to 921.07, 1,271.08 and 501.42

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Solution

The fourth proportional to 921.07, 1,271.08 and 501.42 is: 691.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.07 : 1,271.08 = 501.42 : x
  2. Step 2: Convert to fraction form
    921.07/1,271.08 = 501.42/x
  3. Step 3: Cross multiply
    921.07x = 1,271.08 × 501.42
  4. Step 4: Simplify right side
    921.07x = 637,347.51
  5. Step 5: Solve for x
    x = 637,347.51/921.07
  6. Step 6: Final answer
    x = 691.96

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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.