Home / 12,987.15-19,468.40-4,215.93

Finding the Fourth Proportional to 12,987.15, 19,468.40 and 4,215.93

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Solution

The fourth proportional to 12,987.15, 19,468.40 and 4,215.93 is: 6,319.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.15 : 19,468.40 = 4,215.93 : x
  2. Step 2: Convert to fraction form
    12,987.15/19,468.40 = 4,215.93/x
  3. Step 3: Cross multiply
    12,987.15x = 19,468.40 × 4,215.93
  4. Step 4: Simplify right side
    12,987.15x = 82,077,390.53
  5. Step 5: Solve for x
    x = 82,077,390.53/12,987.15
  6. Step 6: Final answer
    x = 6,319.89

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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.