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Finding the Fourth Proportional to 30,155.40, 45,200.70 and 11,428.20

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Solution

The fourth proportional to 30,155.40, 45,200.70 and 11,428.20 is: 17,130.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,155.40 : 45,200.70 = 11,428.20 : x
  2. Step 2: Convert to fraction form
    30,155.40/45,200.70 = 11,428.20/x
  3. Step 3: Cross multiply
    30,155.40x = 45,200.70 × 11,428.20
  4. Step 4: Simplify right side
    30,155.40x = 516,562,639.74
  5. Step 5: Solve for x
    x = 516,562,639.74/30,155.40
  6. Step 6: Final answer
    x = 17,130.02

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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.