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Finding the Fourth Proportional to 1,015.47, 1,401.93 and 666.77

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Solution

The fourth proportional to 1,015.47, 1,401.93 and 666.77 is: 920.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.47 : 1,401.93 = 666.77 : x
  2. Step 2: Convert to fraction form
    1,015.47/1,401.93 = 666.77/x
  3. Step 3: Cross multiply
    1,015.47x = 1,401.93 × 666.77
  4. Step 4: Simplify right side
    1,015.47x = 934,757.86
  5. Step 5: Solve for x
    x = 934,757.86/1,015.47
  6. Step 6: Final answer
    x = 920.52

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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.