Home / 28,360-39,136.80-15,784.48

Finding the Fourth Proportional to 28,360, 39,136.80 and 15,784.48

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Solution

The fourth proportional to 28,360, 39,136.80 and 15,784.48 is: 21,782.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,360 : 39,136.80 = 15,784.48 : x
  2. Step 2: Convert to fraction form
    28,360/39,136.80 = 15,784.48/x
  3. Step 3: Cross multiply
    28,360x = 39,136.80 × 15,784.48
  4. Step 4: Simplify right side
    28,360x = 617,754,036.86
  5. Step 5: Solve for x
    x = 617,754,036.86/28,360
  6. Step 6: Final answer
    x = 21,782.58

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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.