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Finding the Fourth Proportional to 402,947.40, 603,692.10 and 319,258.20

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Solution

The fourth proportional to 402,947.40, 603,692.10 and 319,258.20 is: 478,309.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,947.40 : 603,692.10 = 319,258.20 : x
  2. Step 2: Convert to fraction form
    402,947.40/603,692.10 = 319,258.20/x
  3. Step 3: Cross multiply
    402,947.40x = 603,692.10 × 319,258.20
  4. Step 4: Simplify right side
    402,947.40x = 192,733,653,200.22
  5. Step 5: Solve for x
    x = 192,733,653,200.22/402,947.40
  6. Step 6: Final answer
    x = 478,309.71

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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.