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Finding the Fourth Proportional to 30,038.40, 45,057.60 and 12,506.40

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Solution

The fourth proportional to 30,038.40, 45,057.60 and 12,506.40 is: 18,759.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,038.40 : 45,057.60 = 12,506.40 : x
  2. Step 2: Convert to fraction form
    30,038.40/45,057.60 = 12,506.40/x
  3. Step 3: Cross multiply
    30,038.40x = 45,057.60 × 12,506.40
  4. Step 4: Simplify right side
    30,038.40x = 563,508,368.64
  5. Step 5: Solve for x
    x = 563,508,368.64/30,038.40
  6. Step 6: Final answer
    x = 18,759.60

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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.