Home / 78,875.10-118,312.65-39,509.10

Finding the Fourth Proportional to 78,875.10, 118,312.65 and 39,509.10

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Solution

The fourth proportional to 78,875.10, 118,312.65 and 39,509.10 is: 59,263.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,875.10 : 118,312.65 = 39,509.10 : x
  2. Step 2: Convert to fraction form
    78,875.10/118,312.65 = 39,509.10/x
  3. Step 3: Cross multiply
    78,875.10x = 118,312.65 × 39,509.10
  4. Step 4: Simplify right side
    78,875.10x = 4,674,426,320.12
  5. Step 5: Solve for x
    x = 4,674,426,320.12/78,875.10
  6. Step 6: Final answer
    x = 59,263.65

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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.