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Finding the Fourth Proportional to 970.13, 1,338.71 and 528.03

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Solution

The fourth proportional to 970.13, 1,338.71 and 528.03 is: 728.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.13 : 1,338.71 = 528.03 : x
  2. Step 2: Convert to fraction form
    970.13/1,338.71 = 528.03/x
  3. Step 3: Cross multiply
    970.13x = 1,338.71 × 528.03
  4. Step 4: Simplify right side
    970.13x = 706,876.40
  5. Step 5: Solve for x
    x = 706,876.40/970.13
  6. Step 6: Final answer
    x = 728.64

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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.