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Finding the Fourth Proportional to 640,902.60, 961,440.30 and 220,307.40

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Solution

The fourth proportional to 640,902.60, 961,440.30 and 220,307.40 is: 330,490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,902.60 : 961,440.30 = 220,307.40 : x
  2. Step 2: Convert to fraction form
    640,902.60/961,440.30 = 220,307.40/x
  3. Step 3: Cross multiply
    640,902.60x = 961,440.30 × 220,307.40
  4. Step 4: Simplify right side
    640,902.60x = 211,812,412,748.22
  5. Step 5: Solve for x
    x = 211,812,412,748.22/640,902.60
  6. Step 6: Final answer
    x = 330,490.80

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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.