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Finding the Fourth Proportional to 7,128.48, 9,838.08 and 5,368.80

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Solution

The fourth proportional to 7,128.48, 9,838.08 and 5,368.80 is: 7,409.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.48 : 9,838.08 = 5,368.80 : x
  2. Step 2: Convert to fraction form
    7,128.48/9,838.08 = 5,368.80/x
  3. Step 3: Cross multiply
    7,128.48x = 9,838.08 × 5,368.80
  4. Step 4: Simplify right side
    7,128.48x = 52,818,683.90
  5. Step 5: Solve for x
    x = 52,818,683.90/7,128.48
  6. Step 6: Final answer
    x = 7,409.53

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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.