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Finding the Fourth Proportional to 423,418.81, 634,994.40 and 139,062.50

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Solution

The fourth proportional to 423,418.81, 634,994.40 and 139,062.50 is: 208,549.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,418.81 : 634,994.40 = 139,062.50 : x
  2. Step 2: Convert to fraction form
    423,418.81/634,994.40 = 139,062.50/x
  3. Step 3: Cross multiply
    423,418.81x = 634,994.40 × 139,062.50
  4. Step 4: Simplify right side
    423,418.81x = 88,303,908,750
  5. Step 5: Solve for x
    x = 88,303,908,750/423,418.81
  6. Step 6: Final answer
    x = 208,549.80

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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.