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Finding the Fourth Proportional to 288,840.40, 432,899.10 and 139,040.56

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Solution

The fourth proportional to 288,840.40, 432,899.10 and 139,040.56 is: 208,386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,840.40 : 432,899.10 = 139,040.56 : x
  2. Step 2: Convert to fraction form
    288,840.40/432,899.10 = 139,040.56/x
  3. Step 3: Cross multiply
    288,840.40x = 432,899.10 × 139,040.56
  4. Step 4: Simplify right side
    288,840.40x = 60,190,533,287.50
  5. Step 5: Solve for x
    x = 60,190,533,287.50/288,840.40
  6. Step 6: Final answer
    x = 208,386.82

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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.