Home / 8,421.28-11,621.40-4,886.58

Finding the Fourth Proportional to 8,421.28, 11,621.40 and 4,886.58

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Solution

The fourth proportional to 8,421.28, 11,621.40 and 4,886.58 is: 6,743.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.28 : 11,621.40 = 4,886.58 : x
  2. Step 2: Convert to fraction form
    8,421.28/11,621.40 = 4,886.58/x
  3. Step 3: Cross multiply
    8,421.28x = 11,621.40 × 4,886.58
  4. Step 4: Simplify right side
    8,421.28x = 56,788,900.81
  5. Step 5: Solve for x
    x = 56,788,900.81/8,421.28
  6. Step 6: Final answer
    x = 6,743.50

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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.