Home / 287,712,939.40-431,569,409.10-285,697,400.20

Finding the Fourth Proportional to 287,712,939.40, 431,569,409.10 and 285,697,400.20

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Solution

The fourth proportional to 287,712,939.40, 431,569,409.10 and 285,697,400.20 is: 428,546,100.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,712,939.40 : 431,569,409.10 = 285,697,400.20 : x
  2. Step 2: Convert to fraction form
    287,712,939.40/431,569,409.10 = 285,697,400.20/x
  3. Step 3: Cross multiply
    287,712,939.40x = 431,569,409.10 × 285,697,400.20
  4. Step 4: Simplify right side
    287,712,939.40x = 123,298,258,185,720,224
  5. Step 5: Solve for x
    x = 123,298,258,185,720,224/287,712,939.40
  6. Step 6: Final answer
    x = 428,546,100.30

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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.