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Finding the Fourth Proportional to 1,666.55, 2,499.26 and 915.89

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Solution

The fourth proportional to 1,666.55, 2,499.26 and 915.89 is: 1,373.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.55 : 2,499.26 = 915.89 : x
  2. Step 2: Convert to fraction form
    1,666.55/2,499.26 = 915.89/x
  3. Step 3: Cross multiply
    1,666.55x = 2,499.26 × 915.89
  4. Step 4: Simplify right side
    1,666.55x = 2,289,030.17
  5. Step 5: Solve for x
    x = 2,289,030.17/1,666.55
  6. Step 6: Final answer
    x = 1,373.51

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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.