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Finding the Fourth Proportional to 1,891.78, 2,602.72 and 1,666.70

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Solution

The fourth proportional to 1,891.78, 2,602.72 and 1,666.70 is: 2,293.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.78 : 2,602.72 = 1,666.70 : x
  2. Step 2: Convert to fraction form
    1,891.78/2,602.72 = 1,666.70/x
  3. Step 3: Cross multiply
    1,891.78x = 2,602.72 × 1,666.70
  4. Step 4: Simplify right side
    1,891.78x = 4,337,953.42
  5. Step 5: Solve for x
    x = 4,337,953.42/1,891.78
  6. Step 6: Final answer
    x = 2,293.05

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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.