Home / 12,987.15-19,480.59-4,102.40

Finding the Fourth Proportional to 12,987.15, 19,480.59 and 4,102.40

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Solution

The fourth proportional to 12,987.15, 19,480.59 and 4,102.40 is: 6,153.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.15 : 19,480.59 = 4,102.40 : x
  2. Step 2: Convert to fraction form
    12,987.15/19,480.59 = 4,102.40/x
  3. Step 3: Cross multiply
    12,987.15x = 19,480.59 × 4,102.40
  4. Step 4: Simplify right side
    12,987.15x = 79,917,075.01
  5. Step 5: Solve for x
    x = 79,917,075.01/12,987.15
  6. Step 6: Final answer
    x = 6,153.55

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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.