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Finding the Fourth Proportional to 640,870.40, 884,416.28 and 354,396.08

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Solution

The fourth proportional to 640,870.40, 884,416.28 and 354,396.08 is: 489,074.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,870.40 : 884,416.28 = 354,396.08 : x
  2. Step 2: Convert to fraction form
    640,870.40/884,416.28 = 354,396.08/x
  3. Step 3: Cross multiply
    640,870.40x = 884,416.28 × 354,396.08
  4. Step 4: Simplify right side
    640,870.40x = 313,433,662,720.18
  5. Step 5: Solve for x
    x = 313,433,662,720.18/640,870.40
  6. Step 6: Final answer
    x = 489,074.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.