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Finding the Fourth Proportional to 9,705.20, 14,557.80 and 8,812.40

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Solution

The fourth proportional to 9,705.20, 14,557.80 and 8,812.40 is: 13,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,705.20 : 14,557.80 = 8,812.40 : x
  2. Step 2: Convert to fraction form
    9,705.20/14,557.80 = 8,812.40/x
  3. Step 3: Cross multiply
    9,705.20x = 14,557.80 × 8,812.40
  4. Step 4: Simplify right side
    9,705.20x = 128,289,156.72
  5. Step 5: Solve for x
    x = 128,289,156.72/9,705.20
  6. Step 6: Final answer
    x = 13,218.60

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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.