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Finding the Fourth Proportional to 459,085.60, 688,725.60 and 139,211.20

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Solution

The fourth proportional to 459,085.60, 688,725.60 and 139,211.20 is: 208,846.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,085.60 : 688,725.60 = 139,211.20 : x
  2. Step 2: Convert to fraction form
    459,085.60/688,725.60 = 139,211.20/x
  3. Step 3: Cross multiply
    459,085.60x = 688,725.60 × 139,211.20
  4. Step 4: Simplify right side
    459,085.60x = 95,878,317,246.72
  5. Step 5: Solve for x
    x = 95,878,317,246.72/459,085.60
  6. Step 6: Final answer
    x = 208,846.27

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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.