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Finding the Fourth Proportional to 15,369.60, 21,220.80 and 9,705.60

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Solution

The fourth proportional to 15,369.60, 21,220.80 and 9,705.60 is: 13,400.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,369.60 : 21,220.80 = 9,705.60 : x
  2. Step 2: Convert to fraction form
    15,369.60/21,220.80 = 9,705.60/x
  3. Step 3: Cross multiply
    15,369.60x = 21,220.80 × 9,705.60
  4. Step 4: Simplify right side
    15,369.60x = 205,960,596.48
  5. Step 5: Solve for x
    x = 205,960,596.48/15,369.60
  6. Step 6: Final answer
    x = 13,400.52

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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.