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Finding the Fourth Proportional to 153,875.34, 212,358.65 and 85,905.68

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Solution

The fourth proportional to 153,875.34, 212,358.65 and 85,905.68 is: 118,555.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,875.34 : 212,358.65 = 85,905.68 : x
  2. Step 2: Convert to fraction form
    153,875.34/212,358.65 = 85,905.68/x
  3. Step 3: Cross multiply
    153,875.34x = 212,358.65 × 85,905.68
  4. Step 4: Simplify right side
    153,875.34x = 18,242,812,740.81
  5. Step 5: Solve for x
    x = 18,242,812,740.81/153,875.34
  6. Step 6: Final answer
    x = 118,555.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.