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Finding the Fourth Proportional to 610,717.20, 916,075.80 and 421,760.40

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Solution

The fourth proportional to 610,717.20, 916,075.80 and 421,760.40 is: 632,640.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    610,717.20 : 916,075.80 = 421,760.40 : x
  2. Step 2: Convert to fraction form
    610,717.20/916,075.80 = 421,760.40/x
  3. Step 3: Cross multiply
    610,717.20x = 916,075.80 × 421,760.40
  4. Step 4: Simplify right side
    610,717.20x = 386,364,495,838.32
  5. Step 5: Solve for x
    x = 386,364,495,838.32/610,717.20
  6. Step 6: Final answer
    x = 632,640.60

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Similar ratio
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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.