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Finding the Fourth Proportional to 15,693.70, 21,657.21 and 8,523.55

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Solution

The fourth proportional to 15,693.70, 21,657.21 and 8,523.55 is: 11,762.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,693.70 : 21,657.21 = 8,523.55 : x
  2. Step 2: Convert to fraction form
    15,693.70/21,657.21 = 8,523.55/x
  3. Step 3: Cross multiply
    15,693.70x = 21,657.21 × 8,523.55
  4. Step 4: Simplify right side
    15,693.70x = 184,596,312.30
  5. Step 5: Solve for x
    x = 184,596,312.30/15,693.70
  6. Step 6: Final answer
    x = 11,762.45

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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.