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Finding the Fourth Proportional to 30,280.80, 45,437.40 and 13,643.40

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Solution

The fourth proportional to 30,280.80, 45,437.40 and 13,643.40 is: 20,472.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,280.80 : 45,437.40 = 13,643.40 : x
  2. Step 2: Convert to fraction form
    30,280.80/45,437.40 = 13,643.40/x
  3. Step 3: Cross multiply
    30,280.80x = 45,437.40 × 13,643.40
  4. Step 4: Simplify right side
    30,280.80x = 619,920,623.16
  5. Step 5: Solve for x
    x = 619,920,623.16/30,280.80
  6. Step 6: Final answer
    x = 20,472.40

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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.