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Finding the Fourth Proportional to 970.95, 1,339.93 and 528.86

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Solution

The fourth proportional to 970.95, 1,339.93 and 528.86 is: 729.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.95 : 1,339.93 = 528.86 : x
  2. Step 2: Convert to fraction form
    970.95/1,339.93 = 528.86/x
  3. Step 3: Cross multiply
    970.95x = 1,339.93 × 528.86
  4. Step 4: Simplify right side
    970.95x = 708,636.42
  5. Step 5: Solve for x
    x = 708,636.42/970.95
  6. Step 6: Final answer
    x = 729.84

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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.