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Finding the Fourth Proportional to 666.60, 919.38 and 430.28

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Solution

The fourth proportional to 666.60, 919.38 and 430.28 is: 593.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.60 : 919.38 = 430.28 : x
  2. Step 2: Convert to fraction form
    666.60/919.38 = 430.28/x
  3. Step 3: Cross multiply
    666.60x = 919.38 × 430.28
  4. Step 4: Simplify right side
    666.60x = 395,590.83
  5. Step 5: Solve for x
    x = 395,590.83/666.60
  6. Step 6: Final answer
    x = 593.45

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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.