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Finding the Fourth Proportional to 15,657.84, 21,611.76 and 9,369.12

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Solution

The fourth proportional to 15,657.84, 21,611.76 and 9,369.12 is: 12,931.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,657.84 : 21,611.76 = 9,369.12 : x
  2. Step 2: Convert to fraction form
    15,657.84/21,611.76 = 9,369.12/x
  3. Step 3: Cross multiply
    15,657.84x = 21,611.76 × 9,369.12
  4. Step 4: Simplify right side
    15,657.84x = 202,483,172.85
  5. Step 5: Solve for x
    x = 202,483,172.85/15,657.84
  6. Step 6: Final answer
    x = 12,931.74

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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.