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Finding the Fourth Proportional to 280,722.64, 387,398.27 and 153,398.25

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Solution

The fourth proportional to 280,722.64, 387,398.27 and 153,398.25 is: 211,690.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,722.64 : 387,398.27 = 153,398.25 : x
  2. Step 2: Convert to fraction form
    280,722.64/387,398.27 = 153,398.25/x
  3. Step 3: Cross multiply
    280,722.64x = 387,398.27 × 153,398.25
  4. Step 4: Simplify right side
    280,722.64x = 59,426,216,671.03
  5. Step 5: Solve for x
    x = 59,426,216,671.03/280,722.64
  6. Step 6: Final answer
    x = 211,690.15

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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.