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Finding the Fourth Proportional to 526.40, 726.59 and 305.45

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Solution

The fourth proportional to 526.40, 726.59 and 305.45 is: 421.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.40 : 726.59 = 305.45 : x
  2. Step 2: Convert to fraction form
    526.40/726.59 = 305.45/x
  3. Step 3: Cross multiply
    526.40x = 726.59 × 305.45
  4. Step 4: Simplify right side
    526.40x = 221,939.50
  5. Step 5: Solve for x
    x = 221,939.50/526.40
  6. Step 6: Final answer
    x = 421.62

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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.