Home / 28,530.60-42,808.70-12,940.20

Finding the Fourth Proportional to 28,530.60, 42,808.70 and 12,940.20

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Solution

The fourth proportional to 28,530.60, 42,808.70 and 12,940.20 is: 19,416.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,530.60 : 42,808.70 = 12,940.20 : x
  2. Step 2: Convert to fraction form
    28,530.60/42,808.70 = 12,940.20/x
  3. Step 3: Cross multiply
    28,530.60x = 42,808.70 × 12,940.20
  4. Step 4: Simplify right side
    28,530.60x = 553,953,139.74
  5. Step 5: Solve for x
    x = 553,953,139.74/28,530.60
  6. Step 6: Final answer
    x = 19,416.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.