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Finding the Fourth Proportional to 621,498.76, 930,752.78 and 421,211.48

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Solution

The fourth proportional to 621,498.76, 930,752.78 and 421,211.48 is: 630,803.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,498.76 : 930,752.78 = 421,211.48 : x
  2. Step 2: Convert to fraction form
    621,498.76/930,752.78 = 421,211.48/x
  3. Step 3: Cross multiply
    621,498.76x = 930,752.78 × 421,211.48
  4. Step 4: Simplify right side
    621,498.76x = 392,043,749,218.09
  5. Step 5: Solve for x
    x = 392,043,749,218.09/621,498.76
  6. Step 6: Final answer
    x = 630,803.75

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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.