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Finding the Fourth Proportional to 525,087.40, 787,112.70 and 258,629.80

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Solution

The fourth proportional to 525,087.40, 787,112.70 and 258,629.80 is: 387,689.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,087.40 : 787,112.70 = 258,629.80 : x
  2. Step 2: Convert to fraction form
    525,087.40/787,112.70 = 258,629.80/x
  3. Step 3: Cross multiply
    525,087.40x = 787,112.70 × 258,629.80
  4. Step 4: Simplify right side
    525,087.40x = 203,570,800,178.46
  5. Step 5: Solve for x
    x = 203,570,800,178.46/525,087.40
  6. Step 6: Final answer
    x = 387,689.36

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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.