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Finding the Fourth Proportional to 529.40, 790.70 and 456.50

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Solution

The fourth proportional to 529.40, 790.70 and 456.50 is: 681.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.40 : 790.70 = 456.50 : x
  2. Step 2: Convert to fraction form
    529.40/790.70 = 456.50/x
  3. Step 3: Cross multiply
    529.40x = 790.70 × 456.50
  4. Step 4: Simplify right side
    529.40x = 360,954.24
  5. Step 5: Solve for x
    x = 360,954.24/529.40
  6. Step 6: Final answer
    x = 681.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.