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Finding the Fourth Proportional to 520,047.80, 778,905.30 and 426,735.80

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Solution

The fourth proportional to 520,047.80, 778,905.30 and 426,735.80 is: 639,146.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,047.80 : 778,905.30 = 426,735.80 : x
  2. Step 2: Convert to fraction form
    520,047.80/778,905.30 = 426,735.80/x
  3. Step 3: Cross multiply
    520,047.80x = 778,905.30 × 426,735.80
  4. Step 4: Simplify right side
    520,047.80x = 332,386,776,319.74
  5. Step 5: Solve for x
    x = 332,386,776,319.74/520,047.80
  6. Step 6: Final answer
    x = 639,146.59

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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.