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Finding the Fourth Proportional to 109,075.20, 163,612.80 and 90,643.20

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Solution

The fourth proportional to 109,075.20, 163,612.80 and 90,643.20 is: 135,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,075.20 : 163,612.80 = 90,643.20 : x
  2. Step 2: Convert to fraction form
    109,075.20/163,612.80 = 90,643.20/x
  3. Step 3: Cross multiply
    109,075.20x = 163,612.80 × 90,643.20
  4. Step 4: Simplify right side
    109,075.20x = 14,830,387,752.96
  5. Step 5: Solve for x
    x = 14,830,387,752.96/109,075.20
  6. Step 6: Final answer
    x = 135,964.80

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1.5x scale

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.