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Finding the Fourth Proportional to 896.78, 1,237.50 and 542.78

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Solution

The fourth proportional to 896.78, 1,237.50 and 542.78 is: 749.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.78 : 1,237.50 = 542.78 : x
  2. Step 2: Convert to fraction form
    896.78/1,237.50 = 542.78/x
  3. Step 3: Cross multiply
    896.78x = 1,237.50 × 542.78
  4. Step 4: Simplify right side
    896.78x = 671,690.25
  5. Step 5: Solve for x
    x = 671,690.25/896.78
  6. Step 6: Final answer
    x = 749.00

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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.