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Finding the Fourth Proportional to 572,140.40, 858,210.60 and 439,689.20

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Solution

The fourth proportional to 572,140.40, 858,210.60 and 439,689.20 is: 659,533.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,140.40 : 858,210.60 = 439,689.20 : x
  2. Step 2: Convert to fraction form
    572,140.40/858,210.60 = 439,689.20/x
  3. Step 3: Cross multiply
    572,140.40x = 858,210.60 × 439,689.20
  4. Step 4: Simplify right side
    572,140.40x = 377,345,932,145.52
  5. Step 5: Solve for x
    x = 377,345,932,145.52/572,140.40
  6. Step 6: Final answer
    x = 659,533.80

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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.