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Finding the Fourth Proportional to 1,666.80, 2,300.16 and 920.74

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Solution

The fourth proportional to 1,666.80, 2,300.16 and 920.74 is: 1,270.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.80 : 2,300.16 = 920.74 : x
  2. Step 2: Convert to fraction form
    1,666.80/2,300.16 = 920.74/x
  3. Step 3: Cross multiply
    1,666.80x = 2,300.16 × 920.74
  4. Step 4: Simplify right side
    1,666.80x = 2,117,849.32
  5. Step 5: Solve for x
    x = 2,117,849.32/1,666.80
  6. Step 6: Final answer
    x = 1,270.61

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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.