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Finding the Fourth Proportional to 28,554.76, 42,831.98 and 7,778.20

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Solution

The fourth proportional to 28,554.76, 42,831.98 and 7,778.20 is: 11,667.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,554.76 : 42,831.98 = 7,778.20 : x
  2. Step 2: Convert to fraction form
    28,554.76/42,831.98 = 7,778.20/x
  3. Step 3: Cross multiply
    28,554.76x = 42,831.98 × 7,778.20
  4. Step 4: Simplify right side
    28,554.76x = 333,155,706.84
  5. Step 5: Solve for x
    x = 333,155,706.84/28,554.76
  6. Step 6: Final answer
    x = 11,667.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.