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Finding the Fourth Proportional to 613,784.40, 919,121.40 and 489,368.40

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Solution

The fourth proportional to 613,784.40, 919,121.40 and 489,368.40 is: 732,812.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,784.40 : 919,121.40 = 489,368.40 : x
  2. Step 2: Convert to fraction form
    613,784.40/919,121.40 = 489,368.40/x
  3. Step 3: Cross multiply
    613,784.40x = 919,121.40 × 489,368.40
  4. Step 4: Simplify right side
    613,784.40x = 449,788,968,923.76
  5. Step 5: Solve for x
    x = 449,788,968,923.76/613,784.40
  6. Step 6: Final answer
    x = 732,812.64

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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.