Home / 28,985.60-40,006-18,915.68

Finding the Fourth Proportional to 28,985.60, 40,006 and 18,915.68

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Solution

The fourth proportional to 28,985.60, 40,006 and 18,915.68 is: 26,107.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,985.60 : 40,006 = 18,915.68 : x
  2. Step 2: Convert to fraction form
    28,985.60/40,006 = 18,915.68/x
  3. Step 3: Cross multiply
    28,985.60x = 40,006 × 18,915.68
  4. Step 4: Simplify right side
    28,985.60x = 756,740,694.08
  5. Step 5: Solve for x
    x = 756,740,694.08/28,985.60
  6. Step 6: Final answer
    x = 26,107.47

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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.