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Finding the Fourth Proportional to 459,140.60, 688,808.10 and 139,266.20

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Solution

The fourth proportional to 459,140.60, 688,808.10 and 139,266.20 is: 208,928.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,140.60 : 688,808.10 = 139,266.20 : x
  2. Step 2: Convert to fraction form
    459,140.60/688,808.10 = 139,266.20/x
  3. Step 3: Cross multiply
    459,140.60x = 688,808.10 × 139,266.20
  4. Step 4: Simplify right side
    459,140.60x = 95,927,686,616.22
  5. Step 5: Solve for x
    x = 95,927,686,616.22/459,140.60
  6. Step 6: Final answer
    x = 208,928.78

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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.