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Finding the Fourth Proportional to 666.81, 919.56 and 573.51

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Solution

The fourth proportional to 666.81, 919.56 and 573.51 is: 790.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.81 : 919.56 = 573.51 : x
  2. Step 2: Convert to fraction form
    666.81/919.56 = 573.51/x
  3. Step 3: Cross multiply
    666.81x = 919.56 × 573.51
  4. Step 4: Simplify right side
    666.81x = 527,376.86
  5. Step 5: Solve for x
    x = 527,376.86/666.81
  6. Step 6: Final answer
    x = 790.90

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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.