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Finding the Fourth Proportional to 439,205, 658,807.50 and 139,686.20

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Solution

The fourth proportional to 439,205, 658,807.50 and 139,686.20 is: 209,529.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,205 : 658,807.50 = 139,686.20 : x
  2. Step 2: Convert to fraction form
    439,205/658,807.50 = 139,686.20/x
  3. Step 3: Cross multiply
    439,205x = 658,807.50 × 139,686.20
  4. Step 4: Simplify right side
    439,205x = 92,026,316,206.50
  5. Step 5: Solve for x
    x = 92,026,316,206.50/439,205
  6. Step 6: Final answer
    x = 209,529.30

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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.