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Finding the Fourth Proportional to 420,000.50, 630,000.75 and 124,512.50

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Solution

The fourth proportional to 420,000.50, 630,000.75 and 124,512.50 is: 186,768.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,000.50 : 630,000.75 = 124,512.50 : x
  2. Step 2: Convert to fraction form
    420,000.50/630,000.75 = 124,512.50/x
  3. Step 3: Cross multiply
    420,000.50x = 630,000.75 × 124,512.50
  4. Step 4: Simplify right side
    420,000.50x = 78,442,968,384.38
  5. Step 5: Solve for x
    x = 78,442,968,384.38/420,000.50
  6. Step 6: Final answer
    x = 186,768.75

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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.