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Finding the Fourth Proportional to 489,783.20, 734,674.80 and 418,924.40

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Solution

The fourth proportional to 489,783.20, 734,674.80 and 418,924.40 is: 628,386.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,783.20 : 734,674.80 = 418,924.40 : x
  2. Step 2: Convert to fraction form
    489,783.20/734,674.80 = 418,924.40/x
  3. Step 3: Cross multiply
    489,783.20x = 734,674.80 × 418,924.40
  4. Step 4: Simplify right side
    489,783.20x = 307,773,199,785.12
  5. Step 5: Solve for x
    x = 307,773,199,785.12/489,783.20
  6. Step 6: Final answer
    x = 628,386.60

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Similar ratio
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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.