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Finding the Fourth Proportional to 2,647.48, 3,971.66 and 915.70

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Solution

The fourth proportional to 2,647.48, 3,971.66 and 915.70 is: 1,373.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.48 : 3,971.66 = 915.70 : x
  2. Step 2: Convert to fraction form
    2,647.48/3,971.66 = 915.70/x
  3. Step 3: Cross multiply
    2,647.48x = 3,971.66 × 915.70
  4. Step 4: Simplify right side
    2,647.48x = 3,636,849.06
  5. Step 5: Solve for x
    x = 3,636,849.06/2,647.48
  6. Step 6: Final answer
    x = 1,373.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.