Home / 20,970.90-28,947.40-13,899.60

Finding the Fourth Proportional to 20,970.90, 28,947.40 and 13,899.60

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Solution

The fourth proportional to 20,970.90, 28,947.40 and 13,899.60 is: 19,186.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.90 : 28,947.40 = 13,899.60 : x
  2. Step 2: Convert to fraction form
    20,970.90/28,947.40 = 13,899.60/x
  3. Step 3: Cross multiply
    20,970.90x = 28,947.40 × 13,899.60
  4. Step 4: Simplify right side
    20,970.90x = 402,357,281.04
  5. Step 5: Solve for x
    x = 402,357,281.04/20,970.90
  6. Step 6: Final answer
    x = 19,186.46

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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.