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Finding the Fourth Proportional to 18,985.70, 28,478.55 and 8,455.70

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Solution

The fourth proportional to 18,985.70, 28,478.55 and 8,455.70 is: 12,683.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.70 : 28,478.55 = 8,455.70 : x
  2. Step 2: Convert to fraction form
    18,985.70/28,478.55 = 8,455.70/x
  3. Step 3: Cross multiply
    18,985.70x = 28,478.55 × 8,455.70
  4. Step 4: Simplify right side
    18,985.70x = 240,806,075.24
  5. Step 5: Solve for x
    x = 240,806,075.24/18,985.70
  6. Step 6: Final answer
    x = 12,683.55

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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.