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Finding the Fourth Proportional to 15,477.60, 21,358.08 and 9,888

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Solution

The fourth proportional to 15,477.60, 21,358.08 and 9,888 is: 13,644.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,477.60 : 21,358.08 = 9,888 : x
  2. Step 2: Convert to fraction form
    15,477.60/21,358.08 = 9,888/x
  3. Step 3: Cross multiply
    15,477.60x = 21,358.08 × 9,888
  4. Step 4: Simplify right side
    15,477.60x = 211,188,695.04
  5. Step 5: Solve for x
    x = 211,188,695.04/15,477.60
  6. Step 6: Final answer
    x = 13,644.80

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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.