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Finding the Fourth Proportional to 2,647.14, 3,970.68 and 915.74

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Solution

The fourth proportional to 2,647.14, 3,970.68 and 915.74 is: 1,373.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.14 : 3,970.68 = 915.74 : x
  2. Step 2: Convert to fraction form
    2,647.14/3,970.68 = 915.74/x
  3. Step 3: Cross multiply
    2,647.14x = 3,970.68 × 915.74
  4. Step 4: Simplify right side
    2,647.14x = 3,636,110.50
  5. Step 5: Solve for x
    x = 3,636,110.50/2,647.14
  6. Step 6: Final answer
    x = 1,373.60

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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.