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Finding the Fourth Proportional to 9,392.79, 12,961.16 and 5,615.20

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Solution

The fourth proportional to 9,392.79, 12,961.16 and 5,615.20 is: 7,748.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,392.79 : 12,961.16 = 5,615.20 : x
  2. Step 2: Convert to fraction form
    9,392.79/12,961.16 = 5,615.20/x
  3. Step 3: Cross multiply
    9,392.79x = 12,961.16 × 5,615.20
  4. Step 4: Simplify right side
    9,392.79x = 72,779,509.95
  5. Step 5: Solve for x
    x = 72,779,509.95/9,392.79
  6. Step 6: Final answer
    x = 7,748.45

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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.