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Finding the Fourth Proportional to 868.72, 1,197.10 and 619.34

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Solution

The fourth proportional to 868.72, 1,197.10 and 619.34 is: 853.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.72 : 1,197.10 = 619.34 : x
  2. Step 2: Convert to fraction form
    868.72/1,197.10 = 619.34/x
  3. Step 3: Cross multiply
    868.72x = 1,197.10 × 619.34
  4. Step 4: Simplify right side
    868.72x = 741,404.38
  5. Step 5: Solve for x
    x = 741,404.38/868.72
  6. Step 6: Final answer
    x = 853.45

Related Problems

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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.