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Finding the Fourth Proportional to 780,391, 1,076,939.58 and 422,695

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Solution

The fourth proportional to 780,391, 1,076,939.58 and 422,695 is: 583,319.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,391 : 1,076,939.58 = 422,695 : x
  2. Step 2: Convert to fraction form
    780,391/1,076,939.58 = 422,695/x
  3. Step 3: Cross multiply
    780,391x = 1,076,939.58 × 422,695
  4. Step 4: Simplify right side
    780,391x = 455,216,975,768.10
  5. Step 5: Solve for x
    x = 455,216,975,768.10/780,391
  6. Step 6: Final answer
    x = 583,319.10

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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.