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Finding the Fourth Proportional to 438,886.89, 658,263.06 and 139,328.64

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Solution

The fourth proportional to 438,886.89, 658,263.06 and 139,328.64 is: 208,971.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,886.89 : 658,263.06 = 139,328.64 : x
  2. Step 2: Convert to fraction form
    438,886.89/658,263.06 = 139,328.64/x
  3. Step 3: Cross multiply
    438,886.89x = 658,263.06 × 139,328.64
  4. Step 4: Simplify right side
    438,886.89x = 91,714,896,912.04
  5. Step 5: Solve for x
    x = 91,714,896,912.04/438,886.89
  6. Step 6: Final answer
    x = 208,971.60

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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.