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Finding the Fourth Proportional to 9,368.70, 12,929.67 and 5,390.70

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Solution

The fourth proportional to 9,368.70, 12,929.67 and 5,390.70 is: 7,439.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,368.70 : 12,929.67 = 5,390.70 : x
  2. Step 2: Convert to fraction form
    9,368.70/12,929.67 = 5,390.70/x
  3. Step 3: Cross multiply
    9,368.70x = 12,929.67 × 5,390.70
  4. Step 4: Simplify right side
    9,368.70x = 69,699,972.07
  5. Step 5: Solve for x
    x = 69,699,972.07/9,368.70
  6. Step 6: Final answer
    x = 7,439.66

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1.5x scale

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.