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Finding the Fourth Proportional to 153,487.29, 211,809.57 and 85,509.87

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Solution

The fourth proportional to 153,487.29, 211,809.57 and 85,509.87 is: 118,002.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,487.29 : 211,809.57 = 85,509.87 : x
  2. Step 2: Convert to fraction form
    153,487.29/211,809.57 = 85,509.87/x
  3. Step 3: Cross multiply
    153,487.29x = 211,809.57 × 85,509.87
  4. Step 4: Simplify right side
    153,487.29x = 18,111,808,795.46
  5. Step 5: Solve for x
    x = 18,111,808,795.46/153,487.29
  6. Step 6: Final answer
    x = 118,002.01

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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.