Home / 8,688.60-11,989.35-5,151.20

Finding the Fourth Proportional to 8,688.60, 11,989.35 and 5,151.20

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Solution

The fourth proportional to 8,688.60, 11,989.35 and 5,151.20 is: 7,108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.60 : 11,989.35 = 5,151.20 : x
  2. Step 2: Convert to fraction form
    8,688.60/11,989.35 = 5,151.20/x
  3. Step 3: Cross multiply
    8,688.60x = 11,989.35 × 5,151.20
  4. Step 4: Simplify right side
    8,688.60x = 61,759,479.77
  5. Step 5: Solve for x
    x = 61,759,479.77/8,688.60
  6. Step 6: Final answer
    x = 7,108.10

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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.