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Finding the Fourth Proportional to 42,455.40, 63,670.95 and 12,866.10

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Solution

The fourth proportional to 42,455.40, 63,670.95 and 12,866.10 is: 19,295.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,455.40 : 63,670.95 = 12,866.10 : x
  2. Step 2: Convert to fraction form
    42,455.40/63,670.95 = 12,866.10/x
  3. Step 3: Cross multiply
    42,455.40x = 63,670.95 × 12,866.10
  4. Step 4: Simplify right side
    42,455.40x = 819,196,809.80
  5. Step 5: Solve for x
    x = 819,196,809.80/42,455.40
  6. Step 6: Final answer
    x = 19,295.47

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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.