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Finding the Fourth Proportional to 7,157.42, 9,877.25 and 3,970.72

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Solution

The fourth proportional to 7,157.42, 9,877.25 and 3,970.72 is: 5,479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,157.42 : 9,877.25 = 3,970.72 : x
  2. Step 2: Convert to fraction form
    7,157.42/9,877.25 = 3,970.72/x
  3. Step 3: Cross multiply
    7,157.42x = 9,877.25 × 3,970.72
  4. Step 4: Simplify right side
    7,157.42x = 39,219,782.91
  5. Step 5: Solve for x
    x = 39,219,782.91/7,157.42
  6. Step 6: Final answer
    x = 5,479.60

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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.