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Finding the Fourth Proportional to 15,567.75, 21,483.50 and 9,978.75

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Solution

The fourth proportional to 15,567.75, 21,483.50 and 9,978.75 is: 13,770.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,567.75 : 21,483.50 = 9,978.75 : x
  2. Step 2: Convert to fraction form
    15,567.75/21,483.50 = 9,978.75/x
  3. Step 3: Cross multiply
    15,567.75x = 21,483.50 × 9,978.75
  4. Step 4: Simplify right side
    15,567.75x = 214,378,475.63
  5. Step 5: Solve for x
    x = 214,378,475.63/15,567.75
  6. Step 6: Final answer
    x = 13,770.68

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Double scale
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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.