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Finding the Fourth Proportional to 526.32, 726.30 and 421.20

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Solution

The fourth proportional to 526.32, 726.30 and 421.20 is: 581.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.32 : 726.30 = 421.20 : x
  2. Step 2: Convert to fraction form
    526.32/726.30 = 421.20/x
  3. Step 3: Cross multiply
    526.32x = 726.30 × 421.20
  4. Step 4: Simplify right side
    526.32x = 305,917.56
  5. Step 5: Solve for x
    x = 305,917.56/526.32
  6. Step 6: Final answer
    x = 581.24

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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.