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Finding the Fourth Proportional to 12,913.64, 19,344.66 and 9,915.08

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Solution

The fourth proportional to 12,913.64, 19,344.66 and 9,915.08 is: 14,852.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,913.64 : 19,344.66 = 9,915.08 : x
  2. Step 2: Convert to fraction form
    12,913.64/19,344.66 = 9,915.08/x
  3. Step 3: Cross multiply
    12,913.64x = 19,344.66 × 9,915.08
  4. Step 4: Simplify right side
    12,913.64x = 191,803,851.47
  5. Step 5: Solve for x
    x = 191,803,851.47/12,913.64
  6. Step 6: Final answer
    x = 14,852.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.