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Finding the Fourth Proportional to 457,698.40, 686,547.60 and 142,187.20

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Solution

The fourth proportional to 457,698.40, 686,547.60 and 142,187.20 is: 213,280.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,698.40 : 686,547.60 = 142,187.20 : x
  2. Step 2: Convert to fraction form
    457,698.40/686,547.60 = 142,187.20/x
  3. Step 3: Cross multiply
    457,698.40x = 686,547.60 × 142,187.20
  4. Step 4: Simplify right side
    457,698.40x = 97,618,280,910.72
  5. Step 5: Solve for x
    x = 97,618,280,910.72/457,698.40
  6. Step 6: Final answer
    x = 213,280.80

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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.