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Finding the Fourth Proportional to 970.81, 1,339.67 and 528.72

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Solution

The fourth proportional to 970.81, 1,339.67 and 528.72 is: 729.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.81 : 1,339.67 = 528.72 : x
  2. Step 2: Convert to fraction form
    970.81/1,339.67 = 528.72/x
  3. Step 3: Cross multiply
    970.81x = 1,339.67 × 528.72
  4. Step 4: Simplify right side
    970.81x = 708,303.62
  5. Step 5: Solve for x
    x = 708,303.62/970.81
  6. Step 6: Final answer
    x = 729.60

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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.