Home / 21,543.68-29,784.80-18,918.40

Finding the Fourth Proportional to 21,543.68, 29,784.80 and 18,918.40

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Solution

The fourth proportional to 21,543.68, 29,784.80 and 18,918.40 is: 26,155.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,543.68 : 29,784.80 = 18,918.40 : x
  2. Step 2: Convert to fraction form
    21,543.68/29,784.80 = 18,918.40/x
  3. Step 3: Cross multiply
    21,543.68x = 29,784.80 × 18,918.40
  4. Step 4: Simplify right side
    21,543.68x = 563,480,760.32
  5. Step 5: Solve for x
    x = 563,480,760.32/21,543.68
  6. Step 6: Final answer
    x = 26,155.27

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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.