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Finding the Fourth Proportional to 970.18, 1,338.79 and 528.08

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Solution

The fourth proportional to 970.18, 1,338.79 and 528.08 is: 728.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.18 : 1,338.79 = 528.08 : x
  2. Step 2: Convert to fraction form
    970.18/1,338.79 = 528.08/x
  3. Step 3: Cross multiply
    970.18x = 1,338.79 × 528.08
  4. Step 4: Simplify right side
    970.18x = 706,985.58
  5. Step 5: Solve for x
    x = 706,985.58/970.18
  6. Step 6: Final answer
    x = 728.72

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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.