Home / 712,815.10-983,686.08-390,518.26

Finding the Fourth Proportional to 712,815.10, 983,686.08 and 390,518.26

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Solution

The fourth proportional to 712,815.10, 983,686.08 and 390,518.26 is: 538,915.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,815.10 : 983,686.08 = 390,518.26 : x
  2. Step 2: Convert to fraction form
    712,815.10/983,686.08 = 390,518.26/x
  3. Step 3: Cross multiply
    712,815.10x = 983,686.08 × 390,518.26
  4. Step 4: Simplify right side
    712,815.10x = 384,147,376,347.82
  5. Step 5: Solve for x
    x = 384,147,376,347.82/712,815.10
  6. Step 6: Final answer
    x = 538,915.88

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Double scale
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Similar ratio
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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.