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Finding the Fourth Proportional to 423,415.81, 634,989.90 and 139,059.50

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Solution

The fourth proportional to 423,415.81, 634,989.90 and 139,059.50 is: 208,545.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,415.81 : 634,989.90 = 139,059.50 : x
  2. Step 2: Convert to fraction form
    423,415.81/634,989.90 = 139,059.50/x
  3. Step 3: Cross multiply
    423,415.81x = 634,989.90 × 139,059.50
  4. Step 4: Simplify right side
    423,415.81x = 88,301,381,107.38
  5. Step 5: Solve for x
    x = 88,301,381,107.38/423,415.81
  6. Step 6: Final answer
    x = 208,545.31

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1.5x scale

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.