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Finding the Fourth Proportional to 1,666.76, 2,300.12 and 920.77

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Solution

The fourth proportional to 1,666.76, 2,300.12 and 920.77 is: 1,270.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.76 : 2,300.12 = 920.77 : x
  2. Step 2: Convert to fraction form
    1,666.76/2,300.12 = 920.77/x
  3. Step 3: Cross multiply
    1,666.76x = 2,300.12 × 920.77
  4. Step 4: Simplify right side
    1,666.76x = 2,117,871.14
  5. Step 5: Solve for x
    x = 2,117,871.14/1,666.76
  6. Step 6: Final answer
    x = 1,270.65

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Half scale
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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.