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Finding the Fourth Proportional to 1,931.99, 2,666.15 and 1,047.80

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Solution

The fourth proportional to 1,931.99, 2,666.15 and 1,047.80 is: 1,445.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,931.99 : 2,666.15 = 1,047.80 : x
  2. Step 2: Convert to fraction form
    1,931.99/2,666.15 = 1,047.80/x
  3. Step 3: Cross multiply
    1,931.99x = 2,666.15 × 1,047.80
  4. Step 4: Simplify right side
    1,931.99x = 2,793,573.40
  5. Step 5: Solve for x
    x = 2,793,573.40/1,931.99
  6. Step 6: Final answer
    x = 1,445.96

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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.