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Finding the Fourth Proportional to 780,424.80, 1,076,984.80 and 422,728.80

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Solution

The fourth proportional to 780,424.80, 1,076,984.80 and 422,728.80 is: 583,364.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,424.80 : 1,076,984.80 = 422,728.80 : x
  2. Step 2: Convert to fraction form
    780,424.80/1,076,984.80 = 422,728.80/x
  3. Step 3: Cross multiply
    780,424.80x = 1,076,984.80 × 422,728.80
  4. Step 4: Simplify right side
    780,424.80x = 455,272,492,122.24
  5. Step 5: Solve for x
    x = 455,272,492,122.24/780,424.80
  6. Step 6: Final answer
    x = 583,364.97

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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.