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Finding the Fourth Proportional to 28,145.40, 38,840.94 and 15,569.40

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Solution

The fourth proportional to 28,145.40, 38,840.94 and 15,569.40 is: 21,485.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,145.40 : 38,840.94 = 15,569.40 : x
  2. Step 2: Convert to fraction form
    28,145.40/38,840.94 = 15,569.40/x
  3. Step 3: Cross multiply
    28,145.40x = 38,840.94 × 15,569.40
  4. Step 4: Simplify right side
    28,145.40x = 604,730,131.24
  5. Step 5: Solve for x
    x = 604,730,131.24/28,145.40
  6. Step 6: Final answer
    x = 21,485.93

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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.