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Finding the Fourth Proportional to 918,070.40, 1,375,702.58 and 385,300.80

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Solution

The fourth proportional to 918,070.40, 1,375,702.58 and 385,300.80 is: 577,362.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,070.40 : 1,375,702.58 = 385,300.80 : x
  2. Step 2: Convert to fraction form
    918,070.40/1,375,702.58 = 385,300.80/x
  3. Step 3: Cross multiply
    918,070.40x = 1,375,702.58 × 385,300.80
  4. Step 4: Simplify right side
    918,070.40x = 530,059,305,599.32
  5. Step 5: Solve for x
    x = 530,059,305,599.32/918,070.40
  6. Step 6: Final answer
    x = 577,362.37

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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.